deliveries/rush: implement the UberRush API #32
Description
The UberRush API allows for food deliveries. Once the functionality is in with a couple of methods of making this possible, it opens up the possibility for this API client to be useable for one off apps e.g a food ordering and delivery app. Given that uberhook has already been implemented, it should become easier to assemble the pieces in order to build a food delivery app and also get notifications of different webhook events.